Will this diffuser cause scraping on speed bumps or steep driveways?

The Circuit diffuser sits lower than factory bumper coverage. Check your vehicle's current ride height and approach angles before installation. If you frequently encounter steep inclines or aggressive speed bumps, verify ground clearance with the diffuser mounted before committing to final fastening.

Is this diffuser purely cosmetic or does it provide functional downforce?

The Circuit design incorporates functional geometry intended to manage rear-end airflow. Real-world downforce benefit scales with speed and driving conditions—highway cruising sees minimal effect, while track sessions or sustained high-speed driving shows more noticeable results. It delivers both visual aggression and aerodynamic intent.

How should I prep the surface before painting?

Sand and prep the surface per your chosen paint system's requirements. Most builders use a 220-grit initial pass followed by finer grits before primer and topcoat. Consult your paint supplier's technical data sheet for specific grit sequences and surface prep standards.